S-SERIES INSTRUMENTS
Proper connector insertion and power to cluster is
assured if the following Indicators react when key
switch is turned on:
1.
Voltmeter pointer moves up scale.
2.
Some warning lights come on (depends on
installation).
3.
Electric gauges Indicate zero.
With power to cluster off, electric gauge pointers
may move to any point on gauge scale. This is a
characteristic of this type of gauge and does not
indicate a faulty part.
GAUGE QUICK CHECKS
If a universal gauge tester is not available, electrical
gauges can also be "quick-checked" to determine if they
are functioning by a simple "Sender Disconnect and
Ground Test" (Table 2). While this a quick test, it does
have two disadvantages.
1.The test tells only that gauge Is functioning. It does not
determine if gauge is accurate.
2.The grounding of sender wire test for a temperature
gauge will damage that unit.
FUEL LEVEL GAUGE
Operation
The electric fuel gauge system consists of two basic
components - the instrument cluster mounted gauge and
the fuel tank sending unit. The tank unit controls the
gauge and the gauge registers the quantity of fuel in the
tank. The two units are connected electrically as shown
in Figure 18.
Figure 18 - Fuel Gauge Circuit Diagram
TABLE 2
GAUGE QUICK CHECK
(Sender Wire Disconnect and Ground Test)
Gauge Reading (With Key Switch "ON")
Type of Gauge
With Sender
With Sender
Wire Disconnected
Wire Grounded
Fuel Level
Above Full Scale
Below Low Scale
Oil Pressure
Above Full Scale
Below Low Scale
Water Temperature
Below Low Scale
Do Not Ground*
Oil Temperature:
Engine
Below Low Scale
Do Not Ground*
Transmission
Below Low Scale
Do Not Ground*
Rear Axle
Below Low Scale
Do Not Ground*
*Grounding temperature sender wire will burn out gauge.
CTS-4140Y - Page 9
